Renewable fuse casing



Aug. 10, 1948, .R. SCHOEPPELL. v 2,446,886

RENEWABLE FUSE CASING Filed June l5, 1944 2 Sheets-Sheet 1 f3 22 35 0 l E .6. 4 INVENTOR y 39 0 Ay5cf/ofppf,

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Patented Aug. 10, 1948 UNITED sTATEsfeArsNr OFFICE RENEWABLE FUSE CASING Ray Schoeppell, Huntington Fark, Calif. Application June 15, 1944, Serial No. 540,421

My invention relates to cartridge-enclosed fuses, in which the fusible element or link may be replaced by the user when blown.

A principal object oi my said invention is to provide for the fusible link and its terminal connections, a cartridge casing having a side opening extending the full length of the fusible element and its said connections, such openings facilitating not only inspection and insertion or replacement, when blown, oi the fusible element, but also the tightening, loosening or other adjustment of its electrical contact holding means Within the cartridge casing.

It is also an important object to provide such a cartridge casing with closure means for said side opening which, while closing with suiiicient tightness to prevent lint and dust collecting around the fusible link and becoming ignited when the fuse is blown, is easily manually operated in opening and closing without the use of tools, and which will facilitate the operation of opening and closing, and will remain in closed position when so set until manually opened.

Still another important object is to provide contact clamping means for the fusible element within the cartridge casing, which are quickly and easily tightened or loosened by use of an ordinary hand wrench, and in which nuts and washers forming part of the clamping means cannot be easily removed from the casing and thus possibly misplaced or lost.

It is also a vital object to pro-vide closure caps for the ends of the cartridge casing which, while permitting easy manipulation in opening and closing the side of the casing, eflectually closes the respective ends of the casing, thus preventing ingress of dust or lint, and which closure cap also, by its rigid connection to the terminal blade extending through it and its telescopic extension within the casing, further facilitates tight closure of the casing While permitting its easy manual opening and closing operation.

Other important advantages, such as simplicity of construction, fewness of parts, ease of assemblage, and consequent comparatively low cost of manufacture, will be apparent to all of skill in this art upon an examination of the following specification, illustrating my preferred embodiment in the light of the drawings forming part hereof, in which- Fig. 1 is a side elevation of the complete assemblage of the device of my invention, showing side closure means of the casing in open position, and illustrating the fusible link within the casing and its contact clamping means;

4 Claims. (C1. 2200-131) Fig. 2 is a perspective View of the device shown in Fig. 1, with side opening of the casing in closed position;

Fig. 3 is a side elevation or" the device, showing side opening of the casing closed;

Fig. 4 is a section on line 4-4 of Fig. l, showing the clamping means in elevation;

Fig. 5 is a section on line 5-5 oi Fig. 3, showing in elevation contact clampingmeans for the fusible element;

Fig. 6 is a section on line 6--5 of Fig. 3, showing spring means for restraining said closure means in closed position;

Fig. '7 is a section on line 'l--l of Fig. 1, showing certain parts in elevation;

Fig. 8 is a section on line 8-3 of Fig. 7, showing clamping means for the fusible element in elevation.

In the drawings, in which like numerals represent similar parts throughout the several views, Ii] designates the cylindrical tubular outer shell of the cartridge casing, which shell is preferably of hard fibrous insulating material well known in the art. Within outer shell lo is closely but rotatably telescoped inner cylindrical tubular shell ll of the cartridge casing.

A cap l2 (of suitable metal well known in the art for the purpose) is provided with a peripheral flange l2, which is adapted to rotatably telescope over the outer adjo-ining end of outer shell l0. Cap I2 is also provided with a preferably integral sleeve Ui (Figs. 7 and 8) which telescopes snugly into adjoining end portions of inner cylindrical tubular shell ll of the casing.

Cap l5, also of metal well known in the art for like purposes, is provided with a peripheral flange l5 which is adapted to rotatably telescope over the outer adjoining end of outer shell IB.

Cap i5 is provided with a preferably integral sleeve Il, which telescopes snugly into adjoining end-portion of inner cylindrical tubular shell Il of the casing.

Terminal blade I8 extends through and fits closely within the walls of a suitable diametrically placed slot I9 centered in the circular end of cap l2, extension 23 (Figs. '7 and 8) of said blade I8 within cap l2 being provided with a bore 2| (Fig. 8)' kthrough which passes a screw later to be described.

Terminal blade i2 extends through and fits closely Within walis of a suitable diametrically placed slot 23 (Fig. 6) centered in the circular end of cap l5, extension 24 (Fig. 5) of said blade 22 within cap l5 being provided with a bore 25 nal washer 29, then through nut 28, and from thence through tapped bore 26a in the adjoining side of sleeve i4, said screw being riveted at its end in a countersunk hole (not numbered) in the inner shell I I.

Through a suitable bore 30 adjacent one endv of inner cylindrical shell il of the-cartridge-- casing, extends screw 3l, which, after passing through a tapped bore in sleeve I1 o cap 115, extends through nut 34 and then through terminal washer 33, then passing through tapped bore 25 in terminal extension 24, and from thence passing through a tapped bore through the opposite side of sleeve l1 of cap I5 and freely through a bore 30al in the adjoining sid-e of inner shell Il, being there riveted i-n a coun-tersunk hole (not numbered) in bore 33a. Outer shell l is provided with a bore (Fig. 8) adapted to register with the head of screw 3| for .the insertion of a screw driver for assemblage purposes.

Opposite ends of fusible element 35 are provided with slots 36 and 31 (most clearly shown in Fig. '1), thus providing a hook at each end of the fusible link 35 for the reception of the shanks of screws 21 and 3l, respectively, the respective slotted ends of fusible element 35 being `clamped between the respective terminal washers .29 .and 33 and each of the terminal blade extensions 2i) and 24 of the terminal blades by tightening, respectively, nuts l28 and 34..

In order to lrestrain undesired relative movement between outer shell I il and inner shell il when :manipulated to closed position, I provide (Fig. 6) a bore y38 through outer shell l0 and inner shell I'l, and extending into but not through sleeve l1 of cap l5, on the .bottom of which lastmentioned bore is seated a helical spring 39. This bore 38- vis of `slightly smaller diameter through outer shell l0 than through inner shell H and into sleeve I1. Within the upper convolutions of helical spring 39 the shank of a semispherical headed pin 40 extends, said shank being shorter than depth of bore .3.8 and being slidable within said bore, its head, however, .being of greater diameter than the bore V3B through outer shell I0. When shells IAD and vIl .are manually rotated with respect `to one `another in opening the closure means, the edge of the bore `33 `of the outer shell will ride over the rounded surface of the head of pin `40 .and the diameter .of said 6 head being slightly less than the .diameter of the bore into the members containing the helical spring, will be pushed within said bore, the vouter shell compressing the pin against the expansion of helical spring 39, so as to permit relative `rotating movement of the outer shell with respect to the -inner shell.

It Awill be understood that `numerous changes in size, design, shape and number of the various parts may be made; also that the cartridge easing may be composed of transparent instead of opaque material as shown in the drawings; and that other means than those specifically disclosed may be employed with like eiect in connecting the fusible element between the terminals-al1 without departing from the s-pirit of my invention as deiined in the appended claims.

What I claim and desire to secure by Letters Patent is:

1. In a cartridge-fuse-casing comprising a shell of insulating material, closure caps having peripheral flanges telescoped over the outer periphery of said shell, and having also inwardly extending sleeves telescoped within and engageable with the bore of said casing, and terminals extending into opposite ends of said shell through .said sleeves, respectively.

2. In a cartridge-fuse-casing comprising an outer tubular shell and an inner tubular shell both of insulating material, said inner shell beingtelescoped within said outer shell, closure caps for said cas-ing having peripheral flanges telescoped over the outer periphery of said outer shell, and which caps also have an inwardly extending sleeve telescoped Within and engageable with said inner shell.

3. In a ydevice ofthe character described, a pair of vslotted tubular casings telescoped together, a terminal lextending into each end of said casings, a pinfprojecti-rrg through each end of said inner casing fand through the terminal thereat, said outer casing being rotatable over the ends of said pins to selectively register and misalign said slots., a fusible element suspended between said pins, and .means to clamp said fusible element against Veach of said terminals.

'4.1m a device ,of the character described, a pair .of slotted tubular casings ltelescoped tom gether and formed of insulating material, a terminal extending into each end of said telescoped casings, a screw projecting through each or" said terminals hav-ing its ends mounted in said inner casing, fsaid inner cas-ing having a slot therein the longitudinal axes :of said screws lying in a common .planeiforrningsu-bstantially right angles with :a radial plane passing through said slot in said inner casing, a fusible strip having slotted ends adapted to engage said screws, respectively, and :a nut 'threaded on eac-h of said screws to clamp the vslotted ends lof the fusible strip to said terminals, respectively, said outer casing being rotatable on :said inn-er casing over the ends of screws and having a slot therein registerable with the Islot in said inner casing upon relative rotation lbetween said casings.

RAY SCHOEPPELL.

REFERENCES CITED The 4following references are of record in the lle of this patent:

UNITED STATES PATENTS Number vName Date 1,107,861 Stout Aug. 18, 1914 1,135,011) Garlitzet al Apr. 18, 1915 1,245,863 Bronson 1 Nov. 6, 1917 jl,`32l;949 Teale Nov. 18, 1919 1,861,179 :Conrad. Feb. 1, 1921 1,860;999 Ellis May 81, 1932 

